“Speak but what may benefit others or yourself; avoid trifling conversation.”
Misattributed, Jackson's personal book of maxims
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Thomas Jackson 58
Confederate general 1824–1863Related quotes

Golden Sayings of Epictetus
Context: Let silence be your general rule; or say only what is necessary and in few words. We shall, however, when occasion demands, enter into discourse sparingly, avoiding such common topics as gladiators, horse-races, athletes; and the perpetual talk about food and drink. Above all avoid speaking of persons, either in the way of praise or blame, or comparison. If you can, win over the conversation of your company to what it should be by your own. But if you should find yourself cut off without escape among strangers and aliens, be silent. (164).
The Agnostic's Prayer from the novel Creatures of Light and Darkness (1969)

“Happiness comes when your work and words are of benefit to yourself and others.”